I’ll allow myself to piggyback on this topic with an issue I think is related to the OP: ever since I upgraded to the MCU I have been experiencing the same issues (car seemingly being asleep and waking up disconnected from LTE, taking minutes to reconnect) and I somehow think it’s related to the car being unable to sleep.
TeslaFi and teslamate (both used in parallel but also independently) are showing that my car hasn’t really been able to « sleep » since the MCU2 upgrade. Setting TeslaFi to report « offline » as being asleep does show small bouts of usually 58 minutes (with no more than 2 hours) sleeping (with a idle/« sleep »/idle almost clock-work like alternance. This leads to the car using up to 0.85 km/h (somewhere in between 0.25 and 0.80 seems to be the norm) in vampire drain/phantom loss.
i have checked the is usual suspects (sentry and summon standby off, tilt/intrusion off, scheduled charging off, unplugged usb devices, reboots…) as well as cycling my API keys and turning off polling for 20 hours a day on TeslaFi to monitor the drain and I can’t get it below 0.25 km/h of loss.
I suspect that these bouts of “offline” is the car truly being offline, and that getting in during one of those bouts is what brings forth the symptoms the OP (and follow up posts) described.
tl;dr: has anyone suffering those loss of connectivity symptoms since their MCU2 upgrade also noticed unusual phantom drain/vampire loss?